Stopper for thermos bottles



May 7, 1940.

A. T. ANTONSON STOPPER FOR THERMOS BOTTLE Filed March 1, 1959 INVENTOR.

BY 57m ATTORNEY.

Patented May 7, 1940 UNITED STATES PATENT OFFICE sTorr-En FOR THERMOSBOTTLES Arvid T. Antonson, Detroit, Mich.

Application March :1, 1939, Serial No. 259,225

1 Claim.

My invention relates to an improvement in a stopper for Thermos bottles,shown in the accompanying drawing and more particularly described in thefollowing specification and claims.

5 An object of the present-invention is to provide means adapted tosecurely maintain the stopper in sealing contact with the discharge neckof the bottle, until it is manually released.

The usual stopper for Thermos bottles is a cork of suitable size lodgedin the neck of the bottle, and hearing at its upper end against theinner face of the customary cover-cup when screwed upon the outerconventional metallic protecting casing of the bottle.

16 The continual usage of the cork, and the manual pressure applied toforce the latter into the neck of the bottle, or in removing the same,causes in time a gradual shifting of the upper end of the cork out ofcontact with the inner 20 face of the conventional cover-cup, screwedupon the customary outer metallic protecting casing.

The adjustment of the cover-cup upon the upper end of the metalliccasing being limited, the cup cannot long contact the upper end of thecork to secure the latter against dislodgment, and therefore the corksoon becomes loose and a leakage of the contents of the bottle results.

In carrying the primary object of this invention into effect, a pair ofresilient telescoping o sleeves are fitted within a longitudinal centralbore extending into the cork from one end, one of the sleeves beingfixed within the bore, the other sleeve being adapted under the urge ofa spring to extend outwardly into contact with the inner face of thecover-cup.

Upon applying manual pressure to force the cork into the neck of thebottle, the projecting sleeve is forced inwardly into the fixed sleevein the body of the cork; the surrounding wall of the cork insuringthe-parts against dislodgment or injury due to rough or carelesshandling.

While resilient means have been employed to maintain the stopper in theneck of a Thermos bottle, the construction has been such that the manualeflort required to remove or insert the cork in the bottle has causedthe unprotected exposed parts to break away from the cork, or becomedetached or displaced through careless handling which results in thedevice being useless, broken or inoperative.

Referring now to the drawing:

' Figure 1 is a fragmentary vertical sectional view, partly inelevation, showing the closure cork lodged in the neck of a Thermosbottle, with the upper end of the cork bearing against the inner face ofa conventional cover-cup, and a spring located between telescopingsleeves, lodged in a central bore formed in the cork.

Figure 2 is a similar view showing the cork in spaced relation to theinner face of the cup, as 5 would occur when the cork is worn, or whenforced further into the neck of the bottle, and out of contact with theinner face of the cup, thus releasing the movable resilient sleeve thatit may bear against the inner face of thede- 1o tachable cup to hold thecork in the bottle against accidental dislodgement.

Figure 3 is an enlarged fragmentary sectional view of the cork, showingthe fixed portion of the telescoping sleeve lodged within the annularwall 15 of the cork, the movable portion being extended to the limit ofits outward movement.

Referring now to the reference numerals on the drawing- Numeral I,denotes the usual outer protecting a sleeve of a Thermos bottle, and 2-is a detachable conventional cup, closing the end of the sleeve.

Numeral 3, indicates a Thermos bottle housed within said protectingsleeve. 35

Numeral 4, denotes a closure cork fitted to the neck of the Thermosbottle, having a central bore forming a socket 5, to receive a pair oftelescoping sleeves i and I, which are protected against accidentalinjury or dislodgment by the 30 encircling wall of cork forming thesocket to receive them. Numeral 8, indicates an expansion spring lodgedwithin the sleeves and hearing at one end against a disc closing thelower end of the stationary sleeve 6, lodged in a socket 35 formed inthe cork; and at the other end against the closed end Ia, of the movablesleeve 1, to force said sleeve against the inner face of the detachablecup 2, to maintain the closure cork 4, in sealing relation with the neckof the Thermos 40 bottle, when the cork becomes worn through use or canno longer be contacted by the inner wall of thedetachable cup uponscrewing the latter down on the upper end of the casing in which theThermos bottle is supported, see Figure 2.

The movable sleeve 1, has an annular rim lb, which upon contacting theinner flange 6b, of the sleeve 6, limits the outward thrust of themovable sleeve resulting from the urge of the expansion spring 8, withinthe sleeves.

Numeral 0, denotes a gasket or washer between the rim 'I3 and flange 68.

Numeral it, indicates a disc, forming a thrust plate for the spring 0,at the end of the sleeve I, u

the disc being secured in place by peening the wall of the sleeve tooverlap the disc.

What I claim is: l

The combination of a Thermos bottle including an outer protecting jacketand a removable closure cup fitted to and engaging the 1 et. a closurecork fitted in the neck of the hot and having a central bore extendingfrom its upper end, a cylindrical open ended sleeve fitting within saidbore and having an inwardly turned flange at its upper end, a secondsleeve having a closed upper end inserted through the open lower end ofthe first mentioned sleeve and slldable therein and having its outersurface engaging the inwardly tumed flange or the first mentioned by thetwo sleeves, a coil spring inserted through the open lower end of thefirst mentioned sleeve and extending into the second mentioned sleeve, adisk in the lower end of the first mentioned sleeve and bearing againstthe lower end of the spring. and an inwardly turned flange carried bythe lower end 01. the first mentioned sleeve for holding the disk insaid sleeve.

mvin r. ANTONSON.

